Detailed Instructions: In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.
Q: Question: How much distance was between Kyŏngwŏn Line and Ch'osŏngri? Passage:After the partition of Korea following the end of the Pacific War, the Kyŏngwŏn Line was split along the 38th parallel between the stations of Hantangang and Ch'osŏngri, and the Korean State Railway, established following the nationalisation of all railways in North Korea in 1946, merged the truncated Wŏnsan−Ch'osŏngri section of the Kyŏngwŏn Line with the Wŏnsan−Kowŏn section of the former Hamgyŏng Line to create the Kangwŏn Line. Following the end of the Korean War and the establishment of the Military Demarcation Line, the section south of Wŏljŏngri ended up in South Korea, where the Korean National Railroad reabsorbed it into the Kyŏngwŏn Line. The section from P'yŏnggang to Kagok has been closed since the end of the war, and since then the line has its current name, from the two termini: P'yŏnggang and Wŏnsan. The line was severely damaged during the Korean War, but was quickly repaired after the war. The Kowŏn−Sep'o Ch'ŏngnyŏn section of the line was electrified in September 1980, and the electrification of the Sep'o Ch'ŏngnyŏn−P'yŏnggang section was completed in early 1986.
 Links: a. Choseong-ri Station b. Woljeong-ri Station c. Choseong-ri Station d. Korean War
A:
a